Happy New Year to you too Xi,
I have never grown anything under lights but my
guess would be to simulate nature as close as possible?

--
Cheers Wendy

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Xi Wang wrote:
Just curious, and perhaps I've missed this in past posts, but if one
grows orchids with artificial lighting, can this light be sustained
day and night (or the majority of a 24 hour period anyway), or do
plants have some sort of circadian rhythm that needs to be
maintained, i.e. needs period of darkness for proper growth?

Cheers and happy new year,
Xi